Dave Street was originally supposed to play a different character - potentially Tony's father. But due to his ailing health and needing to shoot in the same location as his character from Romeo's Distress (2017), it made more sense to bring back Uncle Elmo as the characters would have been similar anyway.
Renee Mandel, Dave Street, and Greg "The Bankrobber" Anderson all passed away during Gouge Away's production. The film is dedicated to them and their memory.
The "lights out" gag at Uncle Greggy's safehouse was inspired by a scene in Edgar Wright's first film A Fistful of Fingers (1995)
70% of the various interior scenes were shot in the same house. Sometimes the same room was used for multiple locations.
Dave Street reprised his role as Uncle Elmo from Romeo's Distress (2017). That would make Tony the Stamper from Gouge Away (2023) and James Ferrose from Romeo's Distress (2017) cousins.